Subway Monitoring and Information Release Spliced Screen Scheme CCTV PIS Same Wall Configuration and Bidding Parameters-Qunmao

Subway video walls are not the same as those used in banks, prisons, or airports. The bank lost picture is a lack of record, the airport lost picture affects the flight operation, the subway station control room lost picture means that the real-time status of the platform, gate machine and escalator disappears from the front of the attendant, and if PIS passenger information is released on separate screens with CCTV, the attendant will have to turn left and right to find information in case of sudden shutdown. In this paper, public bidding documents and interface specifications are used as anchor points to dismantle the configuration logic of OCC/NOCC, station control room and transfer station on the three-level wall structure. The interface constraints, split control items and split seam selection of CCTV and PIS on the same wall partition are translated into a copyable purchase list, and why the docking * * LCD splicing screen Chinese source manufacturers * * can withstand subway acceptance better than traders.

1. first look at the public documents: the actual water level and interface constraints of subway splicing screen procurement

The administrative data of the subway project is not as centralized as that of the airport, but the public documents can dig enough anchor points to push back the configuration.

Training System of a Subway OCC Dispatching CenterThe public technical documents show that the splicing large screen is configured.3 x 6 total 18 pieces 49 inches, resolution ≥ 1920 × 1080, used for line adjustment and monitoring large-screen terminal, connecting splicing large-screen system with ATS system and CCTV video monitoring, and providing full-line track diagram, train position, signal equipment status, screen door status, etc. This configuration corresponds to the core display layer of the OCC dispatch hall. 49 inches is a pragmatic choice in OCC scenarios, because the viewing distance usually exceeds 3 meters and the marginal revenue of 55 inches is limited.

Training device of an urban rail OCC dispatching systemThe bidding parameter requirements: scheduling monitoring large screen upgrade using high-definition video processor,6 4K, 2 2K input, 15 2K output, support network IP decoding on large screen, supporting spell control software. The Bidder shall provide the overall layout diagram of large-screen display, including the overall layout of uplift, integrated monitoring and CCTV monitoring. This clause indicates that the subway project requires suppliers to draw "multi-business zoning" at the bidding stage, rather than waiting for the winning bid before designing.

Bidding Documents for a Line of Hangzhou MetroThe interface between ISCS and PIS is written very specifically: the central level ISCS passes the on-board video information of PIS through the switch of the dispatching hall of the integrated monitoring systemLarge screen controller, PIS vehicle video is displayed on the integrated display system. The ISCS.PIS is also specified. 3 The interface adopts redundant design, and the two systems realize redundant switching by monitoring the working status of the corresponding interface. This interface clause directly proves that the PIS signal of the subway large screen is not "put on the screen", but is connected through the spell controller/large screen controller according to the standard protocol.

Jilin Railway Vocational and Technical CollegeThe 2025 bid announcement shows that the intelligent display system of the dispatching center (splicing screen)16 sets, unit price 10000 yuan, the brand is Youdao Technology/Mutual Vision, model BGCM-55. This unit price corresponds to the purchase water level of the 55-inch splicing unit in the training/small and medium-sized scenarios, and can be used as a budget reference anchor point for station control-level projects.

Several sets of data put together, the classification logic of subway procurement is very clear:OCC level requires that the single-column and multi-service partitions of the controller should be plotted at the bidding stage. The interface between PIS and CCTV has clear protocols and redundancy requirements; The public transaction unit price of the 55-inch splicing unit at the station control level is on the order of 10,000 yuan/block.

The three-level wall-to-wall structure of 2. subway: what to see at each level and what cannot be patrolled round.

The essential difference between the subway scheme and the general monitoring room scheme is in this section. ATS Driving Chart and Section Occupancy of OCC Left ZoneCan not enter the patrol groupEmergency stop/fire/access control alarm window of station control roomCannot be mixed with platform screen, PIS subtitles cannot occupy a camera pane in the form of "browser screen.

The depot/parking lot security center uses 2 × 4 or 3 × 3,55 inch 3.5mm to cover the perimeter, inspection warehouse, washing garage and access section line. The budget priority for this scenario is spare response and 7 × 24 stability, patchwork accuracy is not critical.

3. LCD splicing screen unit: subway version parameter baseline (can be benchmarked with public documents)

The requirements of a government procurement document for splicing units can be used as the reference baseline for subway station control: 49 inches, physical splicing ≤ 3.5mm, brightness 610CD/m, contrast 1200:1, definition ≥ 950TVL,Whole machine design, no flying line screen, complete back shell, viewing angle 178, screen leakage ≤ 0.006cd/m, illuminance 95Klux can work normally. The subway station control room usually does not face the window, 500cd is enough, but the "complete machine design, no flying line screen" is also applicable to subway projects-the station control room has compact space, and the assembly of flying lines is a hidden danger during maintenance.

Another parameter worth including in the control isMTBF≥ 60000h. A political procurement document requires supporting evidence of a test report. In the subway 7 × 24 operating environment, backlight life and power stability directly determine the full life cycle cost, not just the purchase unit price.

4. control and PIS access layer: the layer that the subway is most likely to be "packaged"

The biggest structural difference between the subway project and the general monitoring room is:The spell controller not only needs to solve CCTV, but also needs to connect PIS layer and ISCS/ATS signal.. The bidding document of Hangzhou Metro clearly states that "the central ISCS passes PIS on-board video information, which is transmitted to the large-screen controller through the dispatching hall switch and displayed on the integrated display system". This means that the large-screen controller is a necessary node for PIS video on the wall, not an optional accessory.

• Architecture: Pure hardware FPGA or distributed IP node, no Windows industrial computer. Subway OCC requires 7 × 24 uninterrupted operation. The main reasons for repair are the system collapse of industrial control computer and fan dust accumulation.
• Decoding ability according to the main stream: Write "real solution 32 way 1080P" instead of "maximum support". The decoding parameters given in a political document can be used as reference: H.264/H.265 supports 64 channels 1080P or 128 channels 720P real-time decoding, and every 4 output ports share decoding capability. The subway project shall be calculated according to the actual number of CCTV channels and the number of PIS map layers, leaving 30% allowance.
• PIS access mode: PIS subtitles and videosLayer OverlayThe way to enter the controller does not occupy the camera pane and does not go through the browser screen. The Hangzhou document stipulates that the interface between ISCS and PIS adopts redundant design, and both parties realize switching through mutual monitoring of interface status, and the splicing controller side should also support switching of main and standby signal sources.
• Coordination: FAS fire alarm, ACS demolition, gate reverse flow, train section stop → <2 secondsCut the scene. The trigger source of subway emergency scenarios is usually hard contact (FAS) or platform event (ISCS), and the splicing controller needs to support both hard wire and protocol triggering methods.
• school time: All nodes go CLK/NTP, and the alarm screenshot is stamped with frame. Subway accident investigations are no less time-aligned than airports.
• Redundancy: Dual power supply, hot plug board, automatic switching of main and standby control. The redundancy requirements of the Hangzhou document for the ISCS.PIS interface can be analogized to the control layer.

5. CCTV and PIS "Same Wall with Different Rights": Core Differentiation of Subway Scheme

5.1 Partition Curing

The CCTV area binds the panes according to the "station-layer-bit" code, and does not arrange them randomly according to the channel number. The PIS area is placed on the right or bottom banner layer, showing three statuses of "center distribution/station-level local/emergency template. Small window for equipment status in ISCS area, with green letters on gray background. Hangzhou Metro documents stipulate that ISCS central level provides pre-recorded information templates, with no less than 20 templates and no less than 80 editable characters per template-this number of templates can be used as the lower reference limit for PIS layer configuration.

5.2 permission separation

The operator cut CCTV and adjust the plan. The station operator sends PIS station-level subtitles (secondary confirmation is required); Security guards watch CCTV and receive alarms.The publisher cannot move the monitoring window, and the monitor cannot change the PIS format.. The Hangzhou document also stipulates that the station control room shall provide the PIS screen with one-key power-off function, which is realized through hard wire-this is a physical guarantee for station emergency operation and does not rely on software authority.

5.3 emergency intercutting and network disconnection downgrade

Daily: PIS banner rolling ride tips, CCTV rounds by station. Large passenger flow: CCTV in the station hall is enlarged, and PIS automatically cuts "suspend entry". Sudden outage: lock ATS section on the left side of the whole wall, play CCTV at the affected station in the middle, and PIS with white characters on red background at the bottom.When the center is broken, the local control scene of the station control is not black; when the PIS center fails, the local pre-stored template is broadcast.The requirements of subway operation for fault-oriented safety determine that network disconnection downgrade is a mandatory option, not a bonus.

6. four copyable configuration templates and budget anchors

Template A | Standard Station Control Room

Configuration: 2×2, 46-inch or 49-inch panels, 3.5mm bezel-to-bezel gap, brightness of 500 cd/m². Single hardware control, 16 to 32 road 1080P real solution. The CCTV BAS ACS PIS station-level preview of this station is connected. Curing: Subtitle layer at the bottom of platform/station hall/security check/gate.

Budget Reference: 16 sets of 55-inch splicing screens in Jilin Railway Vocational and Technical College won the bid of 10000 yuan/set. 2 × 2 scale (4 pieces) screen cost about 40000 yuan, plus spell control and bracket, the comprehensive cost is roughly in the range of 6~80000 yuan.

Template B | Transfer Station/Hub Station Control

Configuration: 2 x 3 or 3 x 3,55 inches, 1.7mm. Dual-node control, CCTV/PIS sub-card access. Multi-Line Transfer Thumbnail Select Line Expand PIS Multi-Partition Post Receipt.

Budget reference: according to the political water level of 55 inch 1.7mm flat-splice, the 3 × 3 scale screen body control installation is roughly in the range of 12~180000 yuan, depending on the configuration of the control input and output board.

Template C | Line OCC

Configuration: 4 x 4,55 inch, 1.7mm (or 0.88mm main screen). Distributed spell control chassis ATS/GIS gateway board. The CCTV cascade PIS center of the whole station of the line will issue monitoring FAS linkage.

Budget Reference: An OCC training project 3 × 6 has a total of 18 49-inch splicing screens, which are converted according to the unit price of the public transaction. The screen body part is about 180000 yuan. With the splicing controller, large screen controller and software, the total budget of OCC-level projects is usually in the range of 40~800000 yuan.

Formwork D | Net/NOCC

Configuration: 5 x 3 to 6 x 4,55 inches, 0.88mm. Multi-line cascade, GB/T 28181 to the higher public security/traffic bureau push flow. CCTV grid ATS master map PIS network release status audit log disk.

Budget reference: NOCC level does not have a single public anchor point, but the number of screens (15-24 pieces) plus distributed control cluster, multi-line cascade software and construction, the budget range is usually 80-1.5 million yuan, depending on the seam specifications and the number of cascaded lines.

7. Site Survey List (can be sent directly to Party A before sales)

1. Level Confirmation: Net size, sight distance, floor height and load bearing of wall surface of line net NOCC/OCC/station level. When the viewing distance exceeds 5 meters, 3.5mm is more cost-effective than 1.7 mm.
2. Number of CCTV channels: total number of IPC per line, coding format (H.264/H.265), and whether there are old analog points that need encoder access.
3. PIS Interface: Which PIS Center uses (Self-research/Huawei/Huaqi/Founder, etc.), layer format, and whether there is a standard agreement document. The Hangzhou document requires redundant design of ISCS and PIS interfaces, and it is necessary to confirm whether the splicing controller side supports switching of main and standby signals.
4. ISCS/ATS Interface: The degree of openness between ISCS manufacturer and SDK, whether ATS leaves an interface for the wall end, and whether DP/HDMI direct connection is required.
5. Network isolation: Video network/PIS network/office network VLAN division and whether network gates are required across networks.
6. Maintenance conditions: The width of the corridor of the station control room determines whether the hydraulic rack is maintained before or after. Subway station control room space is usually tight, front maintenance is more common.
7. Emergency trigger mode: FAS hard contact/platform event/manual button to determine the linkage input configuration of the spell controller.
8. Control List: patchwork, brightness, number of decoded paths, GB/T 28181 terms, flame retardant/seismic report, original SLA.

Why does 8. suggest docking LCD splicing screen Chinese source manufacturers

The acceptance logic of subway projects is different from that of ordinary commercial projects: integrators can transfer goods,Pre-adjustment of CCTV and PIS sub-card access, wall color difference, flame retardant and seismic report, spare parts responseThese four things are hard constraints in the daily operation of the station control room and the OCC acceptance stage. In the trader mode, the most common problems are the transfer report and the temporary transfer of sub-card configuration.

One that can stand the questioning of the subway project.LCD splicing screen China source manufacturersIt should be able to answer the following five questions:

• Has CCTV/PIS sub-card been pre-adjusted?: The subway requires CCTV decoding and PIS layers to go on different input boards, and physical isolation does not drag each other. The source factory should be able to complete the pre-adjustment of the sub-card configuration before leaving the factory, instead of re-adjusting it on site.
• Is there a CNAS report page for the measured value of the patchwork seam?Nominal 3.5mm and the actual measured 3.5mm are two different things. Subway tenders usually require a third party test report.
• Flame retardant and seismic reports are not complete: Subway projects require higher safety requirements for screen structure than ordinary commercial scenarios. The installation conditions of station control room and OCC are different, and the report should cover the corresponding models.
• Can the front maintenance hydraulic frame be customized according to the space of the station control room?: Subway station control room corridor is narrow, after maintenance is often not feasible. The bracket is not a standard product and requires drawings.
• Spare Parts Response Policy: Station control room screen failure cannot wait for two weeks. Single screen hot plug replacement spare parts is the bottom line.

Shenzhen Qunmao Qunmao(szqunmao.cn) can push back the splicing specifications, splicing control sub-card configuration and bracket scheme according to the subway bidding document, support OEM/ODM, and make the whole wall color correction at the factory. Tianyan information shows that the company was established in 2021, the registered capital of 2 million-this volume is suitable for the supply side of the allocation according to the tender, rather than claiming "multi-year rail cross-deep cultivation". For integrators, the "splicing unit splicing control node bracket cable" is pre-adjusted and delivered by the same source factory, while the on-site debugging cycle is compressed,The CNAS joint measurement page and the whole wall color calibration report can be issued together with the configuration sheet.。

When selecting the subway project, send five questions to three candidate suppliers: Have you done the pre-adjustment of the sub-card? Has the CNAS patchwork test page? Does the fire-retardant and anti-seismic report cover the bidding model? Can't the front maintenance bracket produce the drawing? How many days will the spare parts arrive? The two that can completely answer and attach supporting documents will enter the next round, and those that cannot be answered will be screened out directly. The attendant in the station control room faces this wall every day, and the incomplete filling of materials during acceptance is rework.

9. Conclusions and Selection Suggestions

• Station Control Room: 46/49 inch 3.5mm is a pragmatic choice, and 1.7mm is not necessary if the viewing distance exceeds 5 meters. Budget priority is reserved for split control cards and spare parts. 55 inch splicing unit open transaction unit price of about 10,000 yuan/block can be used as a reference anchor.
• Line OCC: 55 inch 1.7mm, single row of split controller, PIS layer is connected through large screen controller instead of software screen projection. The CCTV is physically separated from the PIS sub-card.
• Network NOCC: 0.88mm start, distributed control cluster, multi-line cascade, audit log drop. The proportion of screen budget is usually lower than that of spell control and cascade software, and do not over-configure on the seam and compress the spell control slot.
• Procurement action: Take "Splicing Unit Splicing Controller Bracket Cable Control Software" as the overall requirement response. In the subway bid, "splicing screen with built-in decoding" is a trap, and decoding and PIS access must be removed.
• True link: The supplier is required to provide CNAS patchwork test page, flame retardant report, CCTV/PIS sub-card pre-adjustment instructions, and front maintenance bracket drawings. With these four samples together, the basic set of technical review will be stable.

LCD splicing screen China source manufacturersThe value in the subway project, in the final analysis, is to let the person who can be responsible for the pre-adjustment of the sub-card, the inspection report and the customization of the space of the station control room provide the screen, instead of letting the person who can transfer the goods look for the report everywhere during the acceptance.

The parameters and data presented in this document are sourced from public tender documents, government procurement announcements, and enterprise business registration information; the final determination shall be based on on-site project surveys and manufacturer test reports. When selecting the source manufacturer of LCD splicing screen in China, it is recommended to verify the CNAS patchwork test page, flame retardant report, pre-adjustment capability of CCTV/PIS sub-card and spare parts response policy first, and require the supplier to mark "satisfaction/deviation" one by one in the response document ".